//
// Created by jsjxsy on 2022/6/29.
//
/**
 * 单# 取变量名
 * 双## 合并运算, 或者去掉
 * @return
 */
#include <stdio.h>
#define PINT(x) printf(#x"*"#x" = %d\n", (x*x))
#define XANDN(n) x ## n
int main() {
  PINT(5);
  int XANDN(5) = 10;
  printf("x5 = %d\n", x5);
  return 0;
}
